main {

    ul {

        width: 100%;
        display: flex;
        justify-content: space-around;
        flex-wrap: wrap;
        padding: 0 20px;

        li {
            overflow: hidden;
            border-radius: 50%;
            width: 100px;
            height: 100px;
            margin-bottom: 20px;
            
        }

        img {
            width: 100%;
            height: 100%;
        }
    }

    .show-mask{
       transition: all 1s; 
        
    }


}